No. I've purchased more CRKT knives this year than ever before, and I've been pleased each and every time with the quality-to-cost ratio of each purchase.
All of a sudden I'm hearing that the Companion's sheaths are poor, but this is news to me. Yes, it's too heavy for neck carry, but I've had no problems with it otherwise.
Size of thumbstuds is going to be a personal preference thing, I guess.
As for rust, I always assume rust is a risk. I use Break-Free CLP on all my knives as soon as I take them out of the box, and so far I haven't had any unbearable rust outbreaks.
I can't speak to the price of the carbon fiber M16, but I have one in Zytel, and it's a superb knife (at a great price). I don't own a Tighe so I can't comment.
In addition to the Companion and the M16, I've purchased both the large and small Crawford tactical folders from CRKT. They're great, and I couldn't be happier with them. We're a very critical community, and we demand perfection -- but the complaints you've mention don't strike me as indicative of a general trend downward.
On the contrary, I was just thinking earlier this week that CRKT might be the best company currently producing inexpensive "tactical folders," in terms of cost-for-quality.
-Razor
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AKTI #A000845